Elements, Compounds, and Mixtures!

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Presentation transcript:

Elements, Compounds, and Mixtures!

Elements Substances that CANNOT be broken down any further. Helium in balloons Examples- Hydrogen (H) Helium (He) Oxygen (O) Copper (Cu) Copper

Compounds 2 or more substances Chemically combined Separated only by chemical means (by a chemical reaction) Examples: NaCl, H2O NaCl H2O

Mixtures 2 or more substances Physically combined Separated by physical means evaporation, distillation, filtration, chromatography

Heterogeneous Mixtures NOT uniform composition- not thoroughly mixed- you can tell there is more than one substance present Examples: Pizza, Chocolate chip cookie

Homogeneous Mixtures Uniform composition- thoroughly mixed- you can’t tell there is more than one substance present Examples: Air, Salt water, Kool-Aid Air: 78% Nitrogen 21% Oxygen 1% other gases